A better monster indeed. We are back to the story of Jack and Jill, with a horrifying twist. Another strange door appears in the basement of the school in a  storm of lightning. Jack, but not Jack is being carried by someone across the threshold. A tale unfolds of body swapping, bargains, and the ultimate choice for sisters who never got to choose anything. I love that we get to go back to the Moors with some unlikely hero companions to help Jack vanquish the big, bad monster threatening the balance of their chosen world. I absolutely adore this series and every book is a delightful peek into what makes these children so incredibly unique.